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The MXT +3 extension kit gives you a straightforward way to increase magazine capacity on your 12 gauge shotgun. It's built from anodized 6061 aircraft aluminum, which gives you the strength and corrosion resistance you need without excess weight. The kit ships with everything you need to get going: the extension tube itself, a full-length replacement spring, and an end cap.
The genius of the MXT system is its modularity. The extension tube is universal for 12 gauge, which means the same tube works across multiple shotgun platforms. What makes it fit your gun is the MXT extension tube nut, which is model-specific and threads in place of your factory magazine cap. That nut is what actually connects to the tube and secures it. So when you're shopping, you need to match the tube (this +3 kit) with the right nut for your shotgun. The nut isn't included here, but Nordic makes them for most major platforms like Benelli, Mossberg, Remington, Beretta, Browning, Winchester, and more.
The +3 designation means it adds three rounds when you're using standard 2.75 inch star-crimped shells. If you run 3 inch shells, you'll lose about one round of stated capacity because they take up more space in the tube. For 3.5 inch ammo, plan on losing two rounds. Knowing this up front keeps you from being surprised at the range or in the field.
Once you have the right extension nut paired with this kit, installation is straightforward. Some shotguns require minor modifications, like removing factory spring retention devices or smoothing out dimples in the magazine tube, but most users report the process is manageable. The relief groove machined into the tube helps eliminate barrel clamp travel and ensures repeatable placement after disassembly. That same groove is off-center so you can relocate it by simply reversing the tube if needed, since the threads match on both ends. Field reports consistently highlight the build quality and reliable feeding with both target and defense loads.
Yes, you need the MXT extension tube nut that's specific to your shotgun model. The nut threads in place of your factory magazine cap and provides the connection point for the extension tube. Nordic makes nuts for most major shotgun platforms including Benelli, Mossberg, Remington, Beretta, Browning, and Winchester models. The nut is sold separately.
The +3 rating is based on 2.75 inch star-crimped shells. With 3 inch shells, you'll typically hold two extra rounds. With 3.5 inch shells, you'll hold one extra round. This is because longer shells take up more space in the tube, so plan your capacity accordingly based on what you primarily shoot.
The extension tube itself is universal for 12 gauge, but it only works with shotguns that have a compatible MXT extension nut available for their specific model. Most popular platforms are supported, but you'll want to verify that Nordic makes a nut for your shotgun before ordering. Check Nordic's website or contact them directly if you're unsure about your model.
Most installations are straightforward, but some shotguns may require minor modifications like removing factory spring retention devices or smoothing out dimples in the magazine tube. Remington shotguns commonly have dimples that need attention. Check Nordic's fit guide and installation notes for your specific model before installing.
| UPC | 816696021478 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXT-TBS-12-3K |
| Caliber/Gauge | 12 Gauge |
| Model | |
| Color | Black |
| Product Type | Magazine Extension |
| Capacity | 3-Round |
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